Bearing And Shaft Load; Radial Load, Axial Load - Bosch Rexroth MSK030B-0900-NN Project Planning Manual

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Operating conditions and application notes
9.7

Bearing and shaft load

9.7.1

Radial load, axial load

Maximum allowed radial force
Permissible radial force
Permissible axial force
Average speed
During operation, radial and axial forces act on the motor shaft and the motor
bearings. The design of the machine, the selected motor type and the shaft-
side mounting of drive elements must be coordinated to ensure that the
specified load limits are not exceeded.
x Point of application of force
Fig. 9-6: Example diagram of shaft load
The maximum permissible radial force F
factors
● Shaft breaking load
● Force action point x
● Shaft plain or with keyway
The permissible radial load F
● Arithmetically averaged speed (n
● Force action point x
● Bearing service life
The maximum permissible axial force F
shown in the following table.
F [N]
Motor
axial
MSK030 0
MSK04x 30
MSK050 40
MSK060 40
MSK061 40
MSK070 60
MSK071 60
Tab. 9-8: Maximum permissible axial force F
Axial forces are permissible without restriction up to the specified values.
Larger axial forces may be possible after detailed examination by your
Rexroth sales partner. Specify the following information for the valuation:
● Axial and radial force with force application point
● Installation position (horizontal, vertical with the shaft end pointing to the
top or bottom)
● Average speed
Run-up and braking times can be omitted from the calculation if the time dur‐
ing which the drive is operated at constant speed is considerably longer than
DOK-MOTOR*-MSK********-PR12-EN-P
Synchronous Servomotors MSK
depends on the following
radial_max
depends on the following factors
radial
)
average
for the individual motor sizes is
axial
Motor
MSK075
MSK076
MSK100
MSK101
MSK103
MSK131
MSK133
axial
F [N]
axial
60
60
80
80
80
50
50